Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b3e4d74dba9f46…

MALICIOUS

PDF

66.9 KB Created: 2021-08-21 14:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00e05c057840ebb540e9a57f7c25e8e3 SHA-1: 24a0002bffe88e041d33d453e970683f616fa760 SHA-256: 26b3e4d74dba9f46dfcb04a74f63f1f2eb4f6f2e4874a7dad433f9aa6b148ea2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to link farms on disposable hosting or compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7033

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=banana+bread+demo+unblocked+games+66 PDF link annotation
    • https://publicbridge.pl/userfiles/file/17095818886.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/30292293685.pdfIn PDF document text
    • http://sdds.be/userfiles/file/velasutizuvenuno.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/19545732934.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/23764593514.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ecaa8ae215bf47580e0ff293e2209f62/viren.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1800de77f8---28105962695.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/jafuzetaximofi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xukanasowixoponop.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4f665e88c0d117ade1dcd48165532175/tolutixagak.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/85745940229.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/sewul.pdfIn PDF document text
    • http://sooclose.eu/upload/File/lugadaja.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/welanerokivuso.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5efaca812---19699826243.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/xugifod.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1627907047.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uboqqk4gpu37tarkampifarmvc/nemol.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/34980224883.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/1480688358.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/fuwulisokob.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/46937359920.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42F 11076 bytes
SHA-256: dfde5dd5ffad95e01e3a3092df1c3432deac916a880657612aaf7ab3cd68b8f4
font_01_sfnt_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 15792 bytes
SHA-256: f29dca8d5859579715bda1b0c05981287cfb2c67219a79817489d398a13c9a4a

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